I have the pariahs spirited bladed staff of devestation (with 3 end regen and 200 melee dmg) and i will say it is by far the highest dmg 2 hander in game.  I would keep it personally.

Just buy 2 pristine hides and get the fist wraps made, on xeth its about 10g if you supply the ur hide.   Other wise decon the hell out of stuff and get 2 striking crystals.

the only time thundering fist hits less than it should is when a mob hp's is less than the acutal hit for example if a 2 dot mob is in its last bubble i wont hit for the max dmg but less

I had a pair made for handwraps.

1 "of striking" means a finishing crystal was used.  The crystal itself adds to the weapon dmg AND adds the proc.  which is why the striking fist wraps are 66 and the non striking are 54ish.
2 The + melee dmg from devestation crystals is small, its about 50ish.   So if you take the BASE weapon dmg, add devestation, you gain about 12 dmg over  striking.  HOWEVER they give less weapon dmg and melee dmg because + melee dmg isnt calculated into the inital proc, its ADD after all the other dmg.